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R30006 Cobalt vs. EN 1.4981 Stainless Steel

R30006 cobalt belongs to the cobalt alloys classification, while EN 1.4981 stainless steel belongs to the iron alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.

For each property being compared, the top bar is R30006 cobalt and the bottom bar is EN 1.4981 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 220
200
Elongation at Break, % 1.0
39
Fatigue Strength, MPa 260
210
Poisson's Ratio 0.28
0.28
Shear Modulus, GPa 85
77
Tensile Strength: Ultimate (UTS), MPa 900
610
Tensile Strength: Yield (Proof), MPa 540
240

Thermal Properties

Latent Heat of Fusion, J/g 320
290
Melting Completion (Liquidus), °C 1400
1440
Melting Onset (Solidus), °C 1290
1400
Specific Heat Capacity, J/kg-K 450
470
Thermal Conductivity, W/m-K 15
16
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.6
2.2
Electrical Conductivity: Equal Weight (Specific), % IACS 1.7
2.5

Otherwise Unclassified Properties

Density, g/cm3 8.6
7.9
Embodied Carbon, kg CO2/kg material 7.8
4.8
Embodied Energy, MJ/kg 110
67
Embodied Water, L/kg 500
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 7.8
190
Resilience: Unit (Modulus of Resilience), kJ/m3 670
150
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 23
24
Strength to Weight: Axial, points 29
21
Strength to Weight: Bending, points 24
20
Thermal Diffusivity, mm2/s 3.9
4.3
Thermal Shock Resistance, points 26
14

Alloy Composition

Carbon (C), % 0.9 to 1.4
0.040 to 0.1
Chromium (Cr), % 27 to 32
15.5 to 17.5
Cobalt (Co), % 48.6 to 68.1
0
Iron (Fe), % 0 to 3.0
59.6 to 66.7
Manganese (Mn), % 0
0 to 1.5
Molybdenum (Mo), % 0 to 1.0
1.6 to 2.0
Nickel (Ni), % 0 to 3.0
15.5 to 17.5
Niobium (Nb), % 0
0.4 to 1.2
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 2.0
0.3 to 0.6
Sulfur (S), % 0
0 to 0.015
Tungsten (W), % 4.0 to 6.0
0